chem

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Across
  1. 5. a chart that organizes all the chemical elements
  2. 6. the smallest unit of an element
  3. 7. a substance that dissolves another substance
  4. 9. a substance with a pH above 7
  5. 12. a substance that speeds up a chemical reaction
  6. 13. a particle in the nucleus with no charge
  7. 14. a pure substance made of one type of atom
Down
  1. 1. two of more different elements chemically joined
  2. 2. a positively charged particle in the nucleus
  3. 3. when substances change into new substances
  4. 4. atoms of the same element with difference number of neutrons
  5. 8. a negatively charged particle in the nucleus
  6. 10. two or more atoms joined together
  7. 11. a substance with a pH below 7